I live with ten horny climbers (4)
I believe the answer is:
ibex
'horny climbers' is the definition.
Although both the answer and 'climbers' are nouns, they are not in the same form of the noun.
'i live with ten' is the wordplay.
'live' becomes 'be' (synonyms).
'with' means one lot of letters go next to another.
'ten' becomes 'X' (Roman numeral).
'i'+'be'+'x'='IBEX'
Can you help me to learn more?
(Other definitions for ibex that I've seen before include "Wild goat of North Africa" , "Large-horned wild goat" , "Mountain goat with long curved horns" , "Come out of an egg" , "Mountain goat with curving horns" .)